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"access request" CM-LIDU from an AES, the CiES
immediately allocates C channel resources and responds with
a "C channel assignment" CM-LIDU. Simultaneously, the
GES analyses the network-ID contained in the access request
and awaits the completion of the receipt of the service address.
Forward call set-up across the ground network is then
completed.
8.1.4.2.1.2 Abbreviated call estabhhment. Upon receipt
of an "access request" CM-LIDU from an AES, the GES
immediately allocates C channel resources and responds with
a "C channel assignment" CM-LIDU. Simultaneously, the
GES analyses the network-ID contained in the access request
and begins forward call completion across the selected ground
network.
8.1.4.2.2 The GES circuit-mode procedure monitors the
status of the from-aircraft C channel carrier throughout the
call. Loss of carrier for more than tG13 seconds will result in
termination of the call by the GES. When this happens, the
GES will send six "call progress - channel release"
CM-LIDUS during this phase so as to ensure that the AES's
call state is cleared. If the AES carrier were to reappear
(possibly indicative of anomalous propagation conditions nonconducive
to call continuance) the GES will attempt to again
clear the AES call by sendidg six additional "call progress -
channel release" CM-LIDUs m the C channel sub-band and
one on the P channel.
8.1.4.2.3 When the GES passes the forward call
origination to the selected ground network, it must aIso convey
the call priority and the AES and terminal D s of the
originator.- This-will ensure that the ground network can be
sensitive to the call's priority during routing; and that the
ground user is always advised of the identity of the originator
so as to facilitate return calls to aircraft that a controller may
not otherwise be aware of. In those cases where a call is
blocked due to an engaged (busy) condition at the ground
destination, the GES may, as an option: (1) interpret a specific
backward signal from the ground network which indicates that
the call attempt has been recorded at the ground destination,
and then (2) forward a corresponding CM-LIDU to the AES.
This is accomplished by a specific combination of cause codes
in the "call progress - channel release" CM-LIDU and the
BITE 16 telephony event at the interworking interfaces with
the external aircraft and terrestrial networks. This will serve to
alert an aircrew that a ground user has been alerted to the
existence of the unsuccessful call attempt and has been
prcvided the information necessary to initiate a return call at a
later time.
8.1.5.1 Ground earth station (GES) pmedum
8.1.5.1.1 Upon receipt of a call origination from a ground
network, the GES commences a ground-origination by
allocating GES resources to the call and then sending to the
AES via the P channel a "call announcement" CM-LID
followed by a "C channel assignment*' CM-WD. The GES will
then await receipt of the from-aircraft C channel carrier prior
to conducting a continuity check on the C channel sub-band.
The AES will initiate the continuity check by sending a "'call
progress - test" CM-LIDU to which the GES will respond
with a "call progress - test" CM-LIDU every tG35 seconds
until the call is either completed to the aircraft destination or
terminated unsuccessfully (e.g. destination busy, call clearing,
etc.). The AES will aclmowledge receipt of a "call progress -
test" CM-LIDU. thereby completing the continuity check, by
sending either a positive "telephony acknowledge" CM-LIDU
or a "call progress - connect" CM-LIDU. (The latter will
have been sent in lieu of the former if the aircraft user
answered the call immediately after the continuity check
procedure.) The GES will react to either CM-LWU by
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Annex 10 - Aeronautical TelecommunicaLions Volume 111
forwarding an "address complete" BITE to the ground network :
and, in the case of the latter CM-LDU, an "answer" BITE as
well. At this point the talk phase of the call may proceed.
8.1.5.1.2 The GES will monitor the status of the C
channel for the duration of the call. If a "call progress -
connect" CM-LDU is received during this phase and
subsequent to the completion of the continuity check phase,
the GES will forward an "answeri' BlTE to the ground
network and maintain the C channel. The GES monitors the
status of the from-aircraft C channel carrier throughout the
call. LOSS of carrier for more than tG19 seconds will result in
　
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